THU407 Flush Valve Gasket Silicone Seal Compatible with TOTO Toilet Tanks

Key features

• Part Number and SizeTHU407 drain valve seal gasket is designed for toilet flush valve sealing systems, with an approximate 2-1/8" inner diameter. Compatible with TOTO THU407 systems, also compatible with THU440-A, THU451, THU824-A, THU825, THU825-A, THU826-A, and 10A-A flush valve assemblies. Verify valve type and original seal size before purchase.
• Toilet Model CompatibilityCompatible with TOTO toilet systems using THU407-type flush valve assemblies, including models also compatible with CST854ET, MS604114CEF, and MS604114CEFG. Designed for toilet tanks that use this specific drain valve seal structure. Not all toilet models use the same gasket design, so confirm your valve assembly before ordering.
• Silicone Material PerformanceMade from flexible silicone material for long-term water exposure and bathroom tank environments. The material helps maintain elasticity, sealing contact, and compression recovery over time, supporting stable sealing between the toilet tank outlet and flush valve seat.
• Install Location and FunctionInstalled at the base of the flush valve inside the toilet tank, where the drain valve meets the tank outlet. This seal forms the key sealing interface when the toilet is not flushing, helping reduce continuous water flow from the tank into the bowl.
• Leak Repair and Water SavingHelps replace worn, flattened, aged, or deformed seals that may cause continuous running, slow tank leakage, weak flush performance, or unnecessary water waste. A practical maintenance part for toilet leak repair, reducing water loss, lowering leak-related utility costs, and supporting more eco-conscious bathroom maintenance without replacing the full flush valve assembly.

Free shipping included. 30-day hassle-free returns.